﻿// Copyright (c) 2010 Dan Popick

// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Open.Web.Stijl.Utility
{
    public class Set<T>: IEnumerable<T>
    {
        Dictionary<T, byte> _dict;

        public int Count { get { return _dict.Count; } }

        public Set(IEqualityComparer<T> keyCompare) 
        {
            _dict = new Dictionary<T, byte>(keyCompare);
        }

        public void Add(T t) 
        {
            _dict[t] = 0;
        }

        public bool IsSupersetOf(Set<T> set)
        {
            return _dict.Keys.All(x => set._dict.ContainsKey(x));
        }

        public int CountUncommonElements(Set<T> set)
        {
            return _dict.Keys.Count(x => !set._dict.ContainsKey(x));
        }

        public void UnionWith(Set<T> set) 
        {
            foreach (T t in set._dict.Keys)
                Add(t);
        }

        public IEnumerator<T> GetEnumerator()
        {
            return _dict.Keys.GetEnumerator();
        }

        System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
        {
            return _dict.Keys.GetEnumerator();
        }
    }
}
